stuff like that may be a pointless exercise, but can yield interesting results nevertheless.
I just took one of the weakest drafts in Flames history (2005) and the CSS Final Rankings from that year. If we make the experiment and just select the highest ranked player on the CSS rankings with every pick, how would that compare to our actual draft? Answer: equally bad

despite the fact that all selections in this hypothetical draft were in the top 70 on the CSS list!
Darryl Sutter's draft:
1st 26 D Matt Pelech (Sarnia Sting)
3rd 69 D Gord Baldwin (Medicine Hat Tigers)
3rd 74 C Dan Ryder (Peterborough Petes)
4th 111 R J.D. Watt (Vancouver Giants)
5th 128 G Kevin Lalande (Belleville Bulls)
5th 158 G Matt Keetley (Medicine Hat Tigers)
6th 179 C Brett Sutter (Kootenay Ice)
7th 221 D Myles Rumsey (Swift Current Broncos)
And here's the "take the best player from the CSS rankings" mock draft:
1st 26 C Ryan Stoa (US National U-18) --> CSS Final Ranking: 12
3rd 69 R Dan Collins (Plymouth Whalers) --> CSS Final Ranking: 24
3rd 74 L Patrick Davis (Kitchener Rangers) --> CSS Final Ranking: 26
4th 111 C Nick Drazenovic (Prince George Cougars) --> CSS Final Ranking: 29
5th 128 D Paul Kurceba (Red Deer Rebels) --> CSS Final Ranking: 37
5th 158 D Jean-Philippe Paquet (Shawinigan Cataractes) --> CSS Final Ranking: 42
6th 179 C Christian Hanson (Tri-City Americans) --> CSS Final Ranking: 66
7th 221 D Deverea Heshmatpour (Oshawa Generals) --> CSS Final Ranking: 68
EDIT: pretty much the same for 2006. Victor Bartley in the 7th round would win this for the mock draft, the rest is brutal.
1st 26 G Leland Irving (Everett Silvertips)
3rd 87 C John Armstrong (Plymouth Whalers)
3rd 89 C Aaron Marvin (Warroad High School)
4th 118 C Hugo Carpentier (Rouyn-Noranda Huskies)
5th 149 R Juuso Puustinen (Kalpa)
6th 179 L Jordan Fulton (Breck School)
6th 187 D Devin Didiomete (Sudbury Wolves)
7th 209 C Per Jonsson (Farjestad)
vs
1st 26 L Cory Emmerton (Kingston Frontenacs) --> CSS Final Ranking: 10
3rd 87 D Ben Shutron (Kingston Frontenacs) --> CSS Final Ranking: 16
3rd 89 C Bobby Hughes (Kingston Frontenacs) --> CSS Final Ranking: 25
4th 118 D Graham Potuer (Everett Silvertips) --> CSS Final Ranking: 43
5th 149 C Aaron Marvin (Warroad High School) --> CSS Final Ranking: 50
6th 179 C John Armstrong (Plymouth Whalers) --> CSS Final Ranking: 51
6th 187 C Benjamin Breault (Baie-Comeau Drakkar) --> CSS Final Ranking: 57
7th 209 D Victor Bartley (Kamloops Blazers) --> CSS Final Ranking: 64